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/*
* Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.admin.rest.readers;
import java.io.Reader;
/**
* @author Rajeshwar Patil
*/
public class XmlInputReader extends InputReader {
/**
* Construct a XmlInputReader from a string.
*
* @param reader A reader.
*/
public XmlInputReader(Reader reader) {
super(reader);
}
/**
* Construct a InputReader from a string.
*
* @param s A source string.
*/
public XmlInputReader(String s) {
super(s);
}
/**
* Get the text in the CDATA block.
*
* @return The string up to the ]]>.
* @throws InputException If the ]]> is not found.
*/
public String nextCDATA() throws InputException {
char c;
int i;
StringBuffer sb = new StringBuffer();
for (;;) {
c = next();
if (c == 0) {
throw error("Unclosed CDATA");
}
sb.append(c);
i = sb.length() - 3;
if (i >= 0 && sb.charAt(i) == ']' && sb.charAt(i + 1) == ']' && sb.charAt(i + 2) == '>') {
sb.setLength(i);
return sb.toString();
}
}
}
/**
* Get the next XML outer token, trimming whitespace. There are two kinds of tokens: the '<' character which begins a
* markup tag, and the content text between markup tags.
*
* @return A string, or a '<' Character, or null if there is no more source text.
* @throws InputException
*/
public Object nextContent() throws InputException {
char c;
StringBuffer sb;
do {
c = next();
} while (Character.isWhitespace(c));
if (c == 0) {
return null;
}
if (c == '<') {
return XmlInputObject.LT;
}
sb = new StringBuffer();
for (;;) {
if (c == '<' || c == 0) {
back();
return sb.toString().trim();
}
if (c == '&') {
sb.append(nextEntity(c));
} else {
sb.append(c);
}
c = next();
}
}
/**
* Return the next entity. These entities are translated to Characters: & ' > < ".
*
* @param a An ampersand character.
* @return A Character or an entity String if the entity is not recognized.
* @throws InputException If missing ';' in XML entity.
*/
public Object nextEntity(char a) throws InputException {
StringBuffer sb = new StringBuffer();
for (;;) {
char c = next();
if (Character.isLetterOrDigit(c) || c == '#') {
sb.append(Character.toLowerCase(c));
} else if (c == ';') {
break;
} else {
throw error("Missing ';' in XML entity: &" + sb);
}
}
String s = sb.toString();
Object e = entity.get(s);
return e != null ? e : a + s + ";";
}
/**
* Returns the next XML meta token. This is used for skipping over and structures.
*
* @return Syntax characters (< > / = ! ?) are returned as Character, and strings and names are returned as
* Boolean. We don't care what the values actually are.
* @throws InputException If a string is not properly closed or if the XML is badly structured.
*/
public Object nextMeta() throws InputException {
char c;
char q;
do {
c = next();
} while (Character.isWhitespace(c));
switch (c) {
case 0:
throw error("Misshaped meta tag");
case '<':
return XmlInputObject.LT;
case '>':
return XmlInputObject.GT;
case '/':
return XmlInputObject.SLASH;
case '=':
return XmlInputObject.EQ;
case '!':
return XmlInputObject.BANG;
case '?':
return XmlInputObject.QUEST;
case '"':
case '\'':
q = c;
for (;;) {
c = next();
if (c == 0) {
throw error("Unterminated string");
}
if (c == q) {
return Boolean.TRUE;
}
}
default:
for (;;) {
c = next();
if (Character.isWhitespace(c)) {
return Boolean.TRUE;
}
switch (c) {
case 0:
case '<':
case '>':
case '/':
case '=':
case '!':
case '?':
case '"':
case '\'':
back();
return Boolean.TRUE;
}
}
}
}
/**
* Get the next XML Token. These tokens are found inside of angle brackets. It may be one of these characters:
* / > = ! ? or it may be a string wrapped in single quotes or double quotes, or it may be a name.
*
* @return a String or a Character.
* @throws InputException If the XML is not well formed.
*/
public Object nextToken() throws InputException {
char c;
char q;
StringBuffer sb;
do {
c = next();
} while (Character.isWhitespace(c));
switch (c) {
case 0:
throw error("Misshaped element");
case '<':
throw error("Misplaced '<'");
case '>':
return XmlInputObject.GT;
case '/':
return XmlInputObject.SLASH;
case '=':
return XmlInputObject.EQ;
case '!':
return XmlInputObject.BANG;
case '?':
return XmlInputObject.QUEST;
// Quoted string
case '"':
case '\'':
q = c;
sb = new StringBuffer();
for (;;) {
c = next();
if (c == 0) {
throw error("Unterminated string");
}
if (c == q) {
return sb.toString();
}
if (c == '&') {
sb.append(nextEntity(c));
} else {
sb.append(c);
}
}
default:
// Name
sb = new StringBuffer();
for (;;) {
sb.append(c);
c = next();
if (Character.isWhitespace(c)) {
return sb.toString();
}
switch (c) {
case 0:
return sb.toString();
case '>':
case '/':
case '=':
case '!':
case '?':
case '[':
case ']':
back();
return sb.toString();
case '<':
case '"':
case '\'':
throw error("Bad character in a name");
}
}
}
}
/**
* Skip characters until past the requested string. If it is not found, we are left at the end of the source with a
* result of false.
*
* @param to A string to skip past.
* @throws InputException
*/
public boolean skipPast(String to) throws InputException {
boolean b;
char c;
int i;
int j;
int offset = 0;
int n = to.length();
char[] circle = new char[n];
/*
* First fill the circle buffer with as many characters as are in the
* to string. If we reach an early end, bail.
*/
for (i = 0; i < n; i += 1) {
c = next();
if (c == 0) {
return false;
}
circle[i] = c;
}
/*
* We will loop, possibly for all of the remaining characters.
*/
for (;;) {
j = offset;
b = true;
/*
* Compare the circle buffer with the to string.
*/
for (i = 0; i < n; i += 1) {
if (circle[j] != to.charAt(i)) {
b = false;
break;
}
j += 1;
if (j >= n) {
j -= n;
}
}
/*
* If we exit the loop with b intact, then victory is ours.
*/
if (b) {
return true;
}
/*
* Get the next character. If there isn't one, then defeat is ours.
*/
c = next();
if (c == 0) {
return false;
}
/*
* Shove the character in the circle buffer and advance the
* circle offset. The offset is mod n.
*/
circle[offset] = c;
offset += 1;
if (offset >= n) {
offset -= n;
}
}
}
/**
* The table of entity values. It initially contains Character values for amp, apos, gt, lt, quot.
*/
public static final java.util.HashMap entity;
static {
entity = new java.util.HashMap(8);
entity.put("amp", XmlInputObject.AMP);
entity.put("apos", XmlInputObject.APOS);
entity.put("gt", XmlInputObject.GT);
entity.put("lt", XmlInputObject.LT);
entity.put("quot", XmlInputObject.QUOT);
}
}
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